Imagine that you are an astronomer who worked 100 years ago. You might be very surprised by some of the discoveries that astronomers have made since then. Write a short paragraph, outlining these discoveries.

What was the great rift valley formed by

The world wars of the twentieth century immediately led to a. the establishment of a communist bloc in eastern europe b. the urbanization of europe’s societies c. an emphasis on humanism d. an emphasis on ties to greek and roman societies select the best answer from the choices provided. a b c d

Which types of seismic waves travel through earths interior? select all that apply. a) l waves b) p waves c) s waves